地震作用下隧洞动力响应数值分析
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摘要
运用FLAC3D对某无衬砌土质隧洞在地震作用下的动力响应进行了研究,根据位移时程及剪应变增量的变化分析了其破坏机制和规律。计算结果表明:地震作用下由于隧洞临空面对地震波的放大效应,在离临空面一定距离的土体初始将产生一定的永久位移,之后随时间开始收敛,此处土体最终保持了稳定状态;而临空面附近的土体则完全处于屈服状态,位移不随时间收敛,一直向临空面滑移,直至破坏;最大剪应变增量首先出现在侧墙部位,随着地震的持续其范围迅速扩大并向拱顶延伸,同时在拱顶也出现最大剪应变区,当拱顶和侧墙最大剪应变区完全贯通时,隧洞就产生了整体破坏;剪应变增量随地震作用的时间而增大,但增长速率随着地震的持续而减小。研究结果为土质隧洞的抗震设计提供一定的借鉴。
The dynamic response of an unsupported soil tunnel under seismic loading is investigated by using FLAC3Dcode,its failure mechanism and rule is analyzed according to the change of displacement time histories and shear strain increment.The calculating result shows that the ground in certain distance away from the free face would generate some permanent displacement due to the amplified effect of free face against seismic wave.With the progress of time,the displacement would gradually decrease and finally keep a steady state.More specifically,for the shallow buried tunnel,the stored strain energy is small,and hence the destruction would not happen easily.While with the increasing of buried depth,the strain energy can increase correspondingly,as a result,the tunnel would reach closer to limit state and easier to cause failure.However,the ground near the free face would be completely under a yield state and its displacement would gradually increase before final damage.At the beginning,the largest shear strain increment would happen at the sidewall,while the shear strain area would be enlarged dramatically with the continued function of seismic loading,and finally reach the vault.When the largest shear strain in vault and sidewall has coalesced,this means that the tunnel is completely broken.Even though the shear strain increment would be enlarged with the exertion of seismic loading,its increasing rate would decrease with the time.The conclusion in this paper can be referred to the seismic design of soil tunnel.
引文
[1]郑颖人,肖强,叶海林,等.地震隧洞稳定性分析探讨[J].岩石力学与工程学报,2010,29(6):1081-1088.(Zheng Yingren,Xiao Qiang,Ye Hailin,et al.Study of tunnel stability analysis with seismic load[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(6):1081-1088.(in Chinese))
    [2]潘昌实.隧道及地下结构物抗震问题的研究概况[J].世界隧道,1996,(5):7-16.(Pan Changshi.Survey to study of tunnel and underground structure antiseism[J].Tunnel International,1996,(5):7-16.(in Chinese))
    [3]Sharma S,Judd W R.Underground opening damage from earthquake[J].Engineering of Geology.1991,30:263-276.
    [4]李小军.地下隧道式结构动力分析方法研究[M].北京:科学出版社,1997.(Li Xiaojun.Study on dynamic analysis of underground tunnel structures[M].Beijing:Science Press,1997.(in Chinese))
    [5]陈拓,吴志坚,马巍,等.黄土地区场地条件对地震动放大效应影响研究[J].地下空间与工程学报,2012,8(5):969-974.(Chen Tuo,Wu Zhijian,Ma Wei,et al.Study on the effects of site conditions on earthquake ground motion in loess sites[J].Chinese Journal of Underground Space and Engineering,2012,8(5):969-974.(in Chinese))
    [6]郑永来,杨林德.地下结构震害与抗震对策[J].工程抗震,1999,(4):23-28.(Zheng Yong1ai,Yang Linde.Earthquake damage of underground structure and antiseismic method[J].Earthquake Resistant Engineering.1999.(4):23-28.(in Chinese))
    [7]于翔.地下建筑结构应充分考虑抗震问题—1995年阪神地震破坏的启示[J].工程抗震,2002,(4):17-20.(Yu Xiang.Underground structures are always considered possessing well anti-seismic capability revelation of 1995 Hyogoken-Nambu earthquake[J].Earthquake Resistant Engineering.2002,(4):17-20.(in Chinese))
    [8]雷谦荣,丁济新.地震对地下洞室的破坏[J].地下空间,1992,12(4):335-344.(Lei Qianrong,Ding Jixin.Seism induced failure of underground tunnel[J].Underground Space,1992,12(4):335-344.(in Chinese))
    [9]张玉娥,白宝鸿,张耀辉,等.地铁区间隧道震害特点、震害分析方法及减震措施的探讨[J].振动与冲击,2003,22(1):70-71,74.(Zhang Yu’e,Bai Baohong,Zhang Yaohui,et a1.Discussion of earthquake damage characteristics,analytical method and shock absorption measure of subway tunnel[J].Journal of Vibration and Shock,2003,22(1):70-71,74.(in Chinese))
    [10]郑颖人,邱陈瑜,宋雅坤.采用ANSYS软件讨论无衬砌黄土隧洞安全系数[J].地下空间与工程学报,2009,5(2):291-296.(Zheng Yingren,Qiu Chenyu,Song Yakun.Exploring of safety factors of unlined loess tunnel by ANSYS[J].Chinese Journal of Underground Space and Engineering,2009,5(2):291-296.(in Chinese))
    [11]高峰,任侠.黄土窖洞地震反应分析[J].兰州铁道学院学报(自然科学版),2001,20(3):12-18.(Gao Feng,Ren Xia.Seismic responses analysis of a loess cave[J].Journal of Lanzhou Railway University(Natural Science),2001,20(3):12-18.(in Chinese))
    [12]黄润秋,王贤能,唐胜传.深埋隧道地震动力响应的复反应分析[J].工程地质学报,1997,5(1):l-7.(Huang Runqiu,Wang Xianneng,Tang Shengchuan.Complex analysis of seismic response of a mountain tunnel[J].Journal of Engineering Geology,1997,5(1):l-7.(in Chinese))
    [13]U X J,Thomas H R,He Y.An explicit method for the analysis of the earthquake response of nuclear waste repository[R].Research Reports of University of Wales,1997.
    [14]Kirzhner F,Rosenhouse G.Numerical analysis of tunnel dynamic response to earth motions[J].Tunneling and Underground Space Technology,2000,15(3):249-258.
    [15]郑颖人,邱陈瑜,张红,等.关于土体隧洞围岩稳定性分析方法的探索[J].岩石力学与工程学报,2008,27(10):1968-1980.(Zheng Yingren,Qiu Chenyu,Zhang Hong,et al.Exploration of stability analysis methods of surrounding rocks in soil tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(10):1968-1980.(in Chinese))
    [16]谷天峰,王家鼎,任权,等.循环荷载作用下黄土边坡变形研究[J].岩石力学与工程学报,2009,28(增1):3156-3162.(Gu Tianfeng,Wang Jiading,Ren Quan,et al.Study of deformation of loess slope under cyclic load[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(Supp.1):3156-3162.(in Chinese))

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